What You'll Do:

As a Senior Solutions Engineer, you will take strategic ownership of high-impact initiatives, guiding both clients and other team members through complex technical challenges.

You will lead cross-functional projects, ensuring alignment between Commercial, Product, Engineering, and Operations teams, while driving innovation and adoption of best practices across the organisation. You will mentor and guide other engineers, fostering their technical growth and helping them develop effective problem-solving and client-facing skills.

Solutions Engineers cultivate expertise in one or many areas of the Criteo platform. They can build, plan and develop stopgap solutions for new and existing Criteo clients. With a client-facing and consultative approach, they act as trusted advisors, analysing client needs and providing tailored solutions that drive business impact. They ensure clients remain at the centre of every initiative, optimising their experience through technical excellence and strategic guidance.

Candidates must demonstrate strong technical leadership and the ability to build and sustain trusted relationships across business functions. This role requires a high degree of autonomy and judgment, with responsibility for shaping technical direction and ensuring the successful execution of complex initiatives.

The ideal candidate is an autonomous and strategic problem solver with a deep technical background and a proven track record of delivering scalable solutions. They lead innovation by leveraging technologies to enhance Criteo’s offerings, define clear technical direction, and produce high-quality functional and technical specifications that ensure long-term scalability, performance, and maintainability.

What you´ll do

Scale our product and solution portfolio:

• Develop in-depth specialized product and technical knowledge in one or more areas of the Criteo platform, acting as the Client`s and Criteo team’s primary source of product knowledge for your areas of specialization
• Work closely with the other client solutions teams and the clients themselves to understand client business needs and identify opportunities in our current offer
• Serve as a technical mentor and trusted advisor to both clients and internal teams, sharing expertise through workshops, training, and documentation.
• Define, own and execute strategic initiatives to enhance client impact and adoption of Criteo solutions, identifying opportunities beyond the current offering.
• Lead the implementation and rollout of new solutions and features, ensuring scalability and long-term client/business value.
• Provide high-level technical consultancy and advice on specific topics to improve the performance and adoption of our solutions, ensuring optimal customer satisfaction
• Involvement in the scale of new products or solutions added to Criteo’s portfolio by working closely with our clients, account managers, product, technical support and development teams
• Stay at the forefront of industry trends, understanding the evolving AdTech and AI ecosystem to proactively guide internal teams and clients toward innovative and future-proof solutions
• Act as a trusted advisor, ensuring a client-centric approach that aligns technical expertise with business impact

Bring efficiency, quality, and innovation:

• Lead the creation and refinement of internal tools, automated solutions, and prototypes that enhance team efficiency and client satisfaction
• Drive continuous improvement initiatives across processes, ensuring adherence to best practices and elevating team performance
• Provide senior-level guidance on troubleshooting complex issues, connecting with R&D and other stakeholders to ensure timely resolution
• Act as a subject matter expert and key reference for technical decisions, contributing to project structure, architecture, and overall solution quality
• Support the redefinition of daily processes to make the team more efficient and become better partners to our business and internal teams
• Gather, analyse and document needs and requirements from stakeholders to define clear and actionable functional and technical specifications
• Facilitate knowledge sharing by creating comprehensive documentation that can be referenced by internal teams for onboarding, troubleshooting, and further development

Who You Are:

• Computer Engineering or Computer Science degree and certainly have a burning passion for tech, media, marketing, advertising, and internet trends
• Deep knowledge of web technology with proficiency in JavaScript and HTML, as well as one or more coding languages (e.g. Python, NodeJS) and understanding of digital marketing concepts
• Solid SQL skills with practical experience running queries to support analysis, troubleshooting, debugging, validation, and root-cause investigations.
• Fully fluent in English, both spoken and written, with strong interpersonal and communication skills across all levels of interlocutors, including the ability to devise and conduct training on technical topics for a variety of audiences
• Someone who can recognize and structure requirements, understand every angle of an issue and provide a clear and definitive solution
• Confident in client-facing interactions, with the ability to explain technical topics clearly and build trust with stakeholders
• Ability to work autonomously on multiple projects, prioritize, estimate, and deliver according to the plan
• Works well in a close-knit team, instinctively shares product insights, documents new information, is comfortable in sharing best practices, and is open to train or mentor other team members
• Proactive, with a “can-do” attitude and confidence in taking initiatives
• Proven experience in taking full ownership of complex projects, delivering end-to-end solutions independently, and mentoring junior engineers
• Experience leading workshops, internal trainings, and knowledge-sharing sessions, fostering a culture of collaboration and excellence
• You are comfortable designing scalable and maintainable technical solutions, making informed architectural trade-offs, and validating implementation choices against performance and reliability requirements
• 6+ years of relevant work experience
• Must be eligible to work in Spain full-time with no restriction

Familiarity with AI tools is considered a valuable asset. You should be able to seamlessly integrate AI into your workflows to accelerate solution design, automate tasks, support troubleshooting, and enrich technical recommendations for stakeholders. Being AI ready is key to this role and knowledge on how to leverage AI to enhance stakeholder interactions through faster preparation of demos, technical guides, and tailored presentations will bring significant value.

Leverage AI not only to enhance individual workflows but also to develop best practices for the team, documenting insights and sharing learnings to improve collective efficiency.
Guide junior team members in integrating AI into solution design, troubleshooting, and client presentations, ensuring AI adoption aligns with strategic objectives.

We acknowledge that many candidates may not meet every single role requirement listed above. If your experience looks a little different from our requirements but you believe that you can still bring value to the role, we’d love to see your application!​

Who We Are:

What We Offer: